The two photos below, assumed to be from China based on the receipt text, show what looks like deformed chicken wings. On closer inspection, it looks as if the wings were somehow combined with chicken feet, almost like the mouse with the human ear grown on its back.
However, according to the folks who posted the photos originally, these three chicken-feet-like protrusions seemed to actually be wing tips.
The photo below show what happened after the skin was pulled off, revealing something that looks like a bone underneath.
The person who posted the photos speculated that the deformity was the result of hormones–though we’re not so sure.
Sources: http://en.rocketnews24.com/Pokkakitto, funnid